feat(remote-control): add MCP server core feature

.gitmodules

@@ -8,3 +8,6 @@
 	path = extern/FidelityFX-SDK
 	url = https://github.com/alandtse/FidelityFX-SDK-DX11
 	branch = optiscaler-build
+[submodule "extern/cpp-mcp"]
+	path = extern/cpp-mcp
+	url = https://github.com/hkr04/cpp-mcp.git

CMakeLists.txt

@@ -101,6 +101,7 @@ add_subdirectory(${CMAKE_SOURCE_DIR}/cmake/Streamline)
 find_path(DETOURS_INCLUDE_DIRS "detours/detours.h")
 find_library(DETOURS_LIBRARY detours REQUIRED)
 include(FidelityFX-SDK)
+include(cpp-mcp)
 
 target_compile_definitions(
     ${PROJECT_NAME}
@@ -144,6 +145,7 @@ target_link_libraries(
         unordered_dense::unordered_dense
         efsw::efsw
         Tracy::TracyClient
+        cpp-mcp
         Streamline
         d3d12.lib
         Microsoft::DirectX-Headers

cmake/cpp-mcp.cmake

@@ -0,0 +1,107 @@
+# Build cpp-mcp (https://github.com/hkr04/cpp-mcp) from its vendored
+# submodule as a static library target. Upstream has no install rules
+# (PR #12 still open), so we drive its build ourselves — same pattern
+# we use for FidelityFX-SDK and Streamline.
+#
+# Only the server-side translation units are compiled; the bundled
+# stdio/SSE *client* implementations are intentionally omitted because
+# we are exclusively a server.
+#
+# nlohmann_json ABI alignment:
+#   cpp-mcp vendors nlohmann_json 3.11.3 in extern/cpp-mcp/common/json.hpp,
+#   while vcpkg ships 3.12.0. Both versions wrap their public API in an
+#   ABI-versioned inline namespace (`nlohmann::json_abi_v3_11_3` vs
+#   `nlohmann::json_abi_v3_12_0`), so even though both files share the
+#   same include guard (INCLUDE_NLOHMANN_JSON_HPP_), the symbol names
+#   differ. If cpp-mcp's own TUs picked up the vendored copy and our
+#   consumers picked up vcpkg's, `mcp::server::set_capabilities` and
+#   `register_tool` would link-fail (LNK2001) with two different
+#   ABI-tagged signatures.
+#
+#   Fix: patch mcp_message.h at configure time to use
+#   `#include <nlohmann/json.hpp>` instead of `#include "json.hpp"`.
+#   The patched copy is written to a build-tree mirror; the submodule
+#   stays clean. Both cpp-mcp's own compilation and every consumer
+#   then resolve to vcpkg's 3.12.0 → single ABI namespace, symbols
+#   match, linker happy.
+
+set(CPP_MCP_DIR "${CMAKE_SOURCE_DIR}/extern/cpp-mcp")
+set(CPP_MCP_PATCHED_INC "${CMAKE_BINARY_DIR}/cpp-mcp-patched/include")
+
+if(NOT EXISTS "${CPP_MCP_DIR}/src/mcp_server.cpp")
+    message(FATAL_ERROR
+        "cpp-mcp submodule missing. Run:\n"
+        "  git submodule update --init --recursive extern/cpp-mcp")
+endif()
+
+find_package(Threads REQUIRED)
+find_package(nlohmann_json CONFIG REQUIRED)
+
+# Patch mcp_message.h to use vcpkg nlohmann_json (see header comment).
+# All other cpp-mcp headers are copied verbatim into the patched mirror
+# so they live next to the patched header and find each other.
+file(MAKE_DIRECTORY "${CPP_MCP_PATCHED_INC}")
+file(GLOB _cpp_mcp_headers CONFIGURE_DEPENDS "${CPP_MCP_DIR}/include/*.h")
+foreach(_hdr IN LISTS _cpp_mcp_headers)
+    get_filename_component(_name "${_hdr}" NAME)
+    file(READ "${_hdr}" _content)
+    if(_name STREQUAL "mcp_message.h")
+        # Fail fast if the expected include vanishes upstream — otherwise the
+        # ABI mismatch would silently come back and only surface as an LNK2001
+        # well into the link step.
+        string(FIND "${_content}" "#include \"json.hpp\"" _json_inc_pos)
+        if(_json_inc_pos EQUAL -1)
+            message(FATAL_ERROR
+                "cpp-mcp: expected `#include \"json.hpp\"` in mcp_message.h "
+                "but did not find it. Upstream may have changed the include; "
+                "review cmake/cpp-mcp.cmake and adjust the patch (see header "
+                "comment for the ABI-alignment rationale).")
+        endif()
+        string(REPLACE
+            "#include \"json.hpp\""
+            "#include <nlohmann/json.hpp>"
+            _content "${_content}")
+    endif()
+    file(WRITE "${CPP_MCP_PATCHED_INC}/${_name}" "${_content}")
+endforeach()
+
+add_library(cpp-mcp STATIC
+    "${CPP_MCP_DIR}/src/mcp_message.cpp"
+    "${CPP_MCP_DIR}/src/mcp_resource.cpp"
+    "${CPP_MCP_DIR}/src/mcp_server.cpp"
+    "${CPP_MCP_DIR}/src/mcp_tool.cpp"
+)
+
+# Order matters: patched mirror first so its mcp_message.h wins over the
+# submodule's. `common/` is still needed for httplib.h (no ABI issue
+# there — it's not shared with any vcpkg dep).
+target_include_directories(cpp-mcp
+    PUBLIC  "${CPP_MCP_PATCHED_INC}"
+            "${CPP_MCP_DIR}/common"
+)
+
+target_compile_features(cpp-mcp PUBLIC cxx_std_17)
+
+target_compile_definitions(cpp-mcp PUBLIC
+    MCP_MAX_SESSIONS=10
+    MCP_SESSION_TIMEOUT=30
+    # cpp-mcp's vendored cpp-httplib pulls in <winsock2.h>. Skyrim/CLib's
+    # transitive <Windows.h> defaults to the legacy <winsock.h>, which
+    # conflicts (redefinition of sockaddr, WSAData, etc.). Tell Windows
+    # headers to skip the legacy winsock so winsock2.h is the only one
+    # in the build. PUBLIC so it propagates to every TU that links
+    # cpp-mcp (including the PCH compilation of CommunityShaders).
+    _WINSOCKAPI_
+)
+
+target_link_libraries(cpp-mcp PUBLIC
+    Threads::Threads
+    nlohmann_json::nlohmann_json
+)
+
+if(MSVC)
+    target_compile_options(cpp-mcp PRIVATE /utf-8 /bigobj /W0)
+    target_compile_definitions(cpp-mcp PRIVATE _CRT_SECURE_NO_WARNINGS)
+endif()
+
+set_target_properties(cpp-mcp PROPERTIES FOLDER "extern")

features/Remote Control/Shaders/Features/RemoteControl.ini

@@ -0,0 +1,2 @@
+[Info]
+Version = 1-0-0

src/Feature.cpp

@@ -18,6 +18,7 @@
 #include "Features/LightLimitFix.h"
 #include "Features/LinearLighting.h"
 #include "Features/PerformanceOverlay.h"
+#include "Features/RemoteControl.h"
 #include "Features/RenderDoc.h"
 #include "Features/ScreenSpaceGI.h"
 #include "Features/ScreenSpaceShadows.h"
@@ -240,6 +241,7 @@ const std::vector<Feature*>& Feature::GetFeatureList()
 		&globals::features::extendedTranslucency,
 		&globals::features::upscaling,
 		&globals::features::renderDoc,
+		&globals::features::remoteControl,
 		&globals::features::weatherEditor,
 		&globals::features::screenshotFeature,
 		&globals::features::linearLighting,